Device for feeding liquid fuel



April 4, 1939. P. LUCAS I DEVICE FOR FEEDING LIQUID FUEL Filed Dec. 6,1937 A IIW e E rill/11L vii/Ill; 44444444 5 hue/71w Pa u I L u c a s{lb/neg Patented Apr. 4, 1939 PATENT OFFICE 2,153,379 DEVICE FOR FEEDINGLIQUID FUEL Paul Lucas, Berlin-Friedman, Germany, assignor to Ehrich &Graetz Aktien-Gesellschaft,

Berlin, Germany Application December 6, 1937, Serial No.'178,366

In Germany December 3, 1936 4 Claims.

The present invention relates to a process and a device adapted tocontinuously feed liquid fuel to the carburettor of stoves, incandescentlamps, cookers and the like by means of a'fuel pump 5 whilst using theexhaust gases as source of power.

It has already been suggested to use for working carburettors of suchnature of incandescent lamps a circulating suction and-pressure devicewhich is made to revolve by means of a vanewheel, rigidly connected toit and actuated by the waste heat 'of the lamp, thereby acting upon apiston pump, alternately sucking and pressin said pump being connectedto the suction and pressure device by means of a pipe line and caus- 5ing, in consequence of its movement, the fuel to be fed to thecarburettor. In the known arrangement the pump is actuated'by some kindof calor- 10 or hot-air engine and it has .been ascertained that it willnot be possible in connection'with to continuous operation tosufficiently cool with each revolution the quantity of air contained inthe caloric or hot-air engine, particularly in view of the fact, thatthe space to be kept cool, is located comparatively closely'to theheating source in consequence of the naturally rather compactarrangement. As a result thereof, the caloric or hot-air engine willdevelop a sufficient performance only in the initial stages, but rapidlydrops in continuous operation, so that it will be im- 50 possible toattain a sufficient pressure. In addition thereto, the known arrangementis rather complicated and, for this reason, expensive in manufacture.

The process embodied in the present invention is distinguished from theknown by the fact, that by means of the lifting pressure of the hotexhaust gases of the stove, cooker, lamp and the like, a vane-wheelmotor is caused to revolve uniformly, immediately and positively drivinga piston pump, which feeds the fuel to the carburettor inuniformquantities and under a pressure which is 'suflicient for working thestove-, cookeror lamp-burner.

The arrangement of the present invention for m the purpose of carryingout the process described in the foregoing, is characterized by theprovision of a vane-wheel motor at the upper exit end of the exhaustpipe and by the immediate and positive drive of the vertically workingpump piston through the perpendicular axis of the motor by means ofcrank, connecting rod and bellcrank levers. Universal joints of simpleconstruction can,,in case of emergency, also be used.

Whilst it is necessary to use in the known stoves, lamps and cookers acarburettor pressure of 1 atm., it has been rendered possible by meansof the present invention to use a very much lower carburettor pressureof about A to atm., yet attaining, the identical effects as with theusual carburettors in connection with the high 5 pressure of 1 atm.

The technical progress of the process and of the arrangement or deviceaccording to the present invention consists in the extraordinarysimplicity of the process and of the arrangement, 10 in the use of amost simple motoric .power and in the simple immediate and positivedrive of the pump through the medium of thissource of power. In view ofthe fact, that the source of power available is only small, thearrangement, according to the present invention, has been so designed,that the losses caused by friction, are kept within narrow limits andthat the most simple means for the generation of power and transmissionthereof, are employed. Further advantageous features of the presentinvention are represented by the absolute reliability of working and thecomplete absence of danger of whatever description in case of failure orbreakdown, because in such case the stove, lamp or cooker will beautomatically extinguished. An unintentional escape of liquid fuel hasbeen rendered quite impossible.

The shutting down-of the device is effected,.in accordance with thepresent invention, by means of a closing member, regulating an outletfrom the carburettor to the container. Furthermore, the mechanicalstructure of the device according to the present invention isdistinguished by a great simplicity, inasmuch as the carburettor, thevaporizing pipe arrangement and all pump parts with driving gear arecombined to form a unit or aggregate being self-contained and permittingto be lifted off the container. According to the present invention thevertical vane-wheel spindle is provided with a crank and divided abovethe latter, so that the vane-wheel with its spindle can be lifted offthe lower portion of the spindle and coupled with it merely by placingit upon said lower portion.

In the accompanying drawing a form of per formance of the presentinvention in application to a heating stove has been illustrated by wayof example, in which v Fig. 1 represents the device in longitudinal sec-5 tion and Fig. 2 a detail of the spindle of the vane-wheel motor.

The fuel container I of the heating stovesupports a plate 2, upon whichthe fuel pump and 7 may be composed of separate square bars ma-' thecarburettor with the vaporizing pipe arrangement is disposed andcombined so as to form a self-contained unit or aggregate adapted to belifted off the container. The pump comprises a suction casing 3 which isinserted in a hole of the plate with a tapering tube pivot 4, beingintroduced into the container from, above, and a suction pipe 6 withsuction basket 1 provided at the lower end of said pipe, in connectionwith which the suction pipe is inserted in a pipe body 5 of the suctioncasing. The body 5 forms a seat for the spherically shaped suction valve3. Within a pipe 3, inserted in the suction casing 3, a piston III hasbeen accommodated with play and is adapted to be displaced in aperpendicular direction. The piston ill forces the fuel, sucked in bythe spherical valve, from the pipe 6 through a duct H and via the ballpressure valve I2, the pressure chamber l3, the duct l4, into thecarburettor l5, from which the vaporized fuel is fed through the duct orchannel l6, nozzle ll, whilst being mixed with air through the mixingpipe l8, l9, into the separate burners along the path characterized bythe arrows 20, finally landing in hot tubes 22, consisting of a ceramicmaterial, after having passed through obliquely perforated screens 2|. Aportion of the fuel mixture flows, according to arrow 24, into the pipein a downward direction, feeding at the apertures 26 an auxiliary flamewithin a heating dish 21, through the heat of which the reinforcedwell-conducting carburettor pipe 28 will be heated. The chief mixtureundergoes combustion at the apertures 23 of the hot tubes. Below thereinforced carburettor pipe 28 will be found the preliminary heatingdish 29. A connecting channel 30, 3| between the carburettor andcontainer is regulated or controlled by means of a regulating or controlvalve 32, which is closed when the heating stove is workingnormally,.but will be opened for the purpose of establishingcommunication between carburettor and containers, if it is desired toextinguish the stove immediately, inasmuch as the fuel within thecarburettor under pressure, flows back into the container forthwith. Thefume pipe or jacket 33 is provided atthe point, where the hot tubes arelocated, with an aperture 34, through which the hot pipes 22 radiatesheat into the room to be heated. Combustion air enters through apertures35 distributed uniformly along the lower periphery of the jacket, whilstthe hot exhaust gases from the hot pipes rise upwards within the fumepipe 33 and, passing through an annular cross section 36 in a bafileplate 31, are made to strike the vane-wheel 38, thereby causing thelatter and its vertical spindle 39 to uniformly revolve. At its lowerend the spindle 33 is provided with a bore, which is simply pushed overa pivot 40 of the lower spindle extension 4! or, if necessary, specialsimple coupling means may be used for that purpose. The spindle 4| has acrank 42, the play of which is transmitted by a guide 43 to a pivot 44of a bell-crank lever 45 driving, by means of a connecting rod 46, thepump piston It. The lower portion of the spindle 4| is accommodatedwithin an axle 41 with a certain amount of play and rests with atapering end upon a shaft-step or stone 43. Fuel that may have beencarried along by the upward movement of the piston is trapped in theannular space 49 and made to flow back into the container via a piping60. .The bell-crank lever 45 is pivoted to an arm 51 flxed to the pumpcasing. The pump casing chined or automatic lathes which, by way ofexample, may be soldered together.

In a similar manner, an incandescent lamp or a cooker can be designedaccording to the process embodied in the present invention.

What I claim is:

1. Device for continuously feeding liquid fuel to the vaporizer ofstoves, incandescent lamps, cookers and the like, comprising a fuelcontainer, a vaporizer, a nozzle, a mixing pipe, a burner, a flue forthe exhaust gases from the burner, a fuel pump including a cylinder anda piston movable therein, a vane-wheel motor at the upper end of theflue rotatable by the lifting pressure of the hot exhaust gases, avertical spindle for the vane-wheel motor, means for positively couplingsaid vertical spindle of the vane-wheel motor to said movable piston,and connecting conduits between the fuel container and the vaporizer.

2. Device for continuously feeding liqued fuel to the vaporizer ofstoves, incandescent lamps, cookers and the like, comprising a fuelcontainer,

, a vaporizer, a'nozzle, a mixing pipe, a burner, a

flue for the exhaust gases from the burner, a liquid fuel pump in theshape of a piston pump, including a cylinder and a movable pistontherein, a vane-wheel motor at the upper end of the flue rotatable bythe lifting pressure of the hot exhaust gases, a vertical spindle forthe vanewheel motor, means for positively coupling said vertical spindleof the vane-wheel motor to said movable piston, said means consisting ofa crank, a connecting rod and a bell crank lever, and connectingconduits between the fuel container and the vaporizer.

3. Device for continuously feeding liquid fuel to the vaporizer ofstoves, incandescent lamps, cookers and the like, comprising a fuelcontainer, a vaporizer, a nozzle, a mixing pipe, a burner, a flue fromthe exhaust gases from the burner, a liquid fuel pump comprising acylinder and a piston reciprocable therein, a vane-wheel motor at theupper end of the flue rotatable uniformly by the lifting pressure of thehot exhaust gases, a vertical spindle for said vane-wheel motor, meansfor coupling said vertical spindle to said piston, including a crank, aconnecting rod and a bell crank lever, connecting pipes between the fuelcontainer and the vaporizer, a cut-off member controlling the connectionleading from the vaporizer of the apparatus to the fuel container, abase plate connecting the vaporizer, the mixing pipe arrangement and allthe pump members to form a self-contained unit adapted to be lifted offthe fuel container.

4. Device for continuously feeding liquid fuel to the vaporizer ofstoves, incandescent lamps, cookers and the like, comprising a fuelcontainer, a vaporizer, a nozzle, a mixing pipe, a burner, a flue fromthe exhaust gases from the burner, a liquid fuel pump including acylinder and a piston movable therein, a vane-wheel motor at the upperend of the flue which is made to rotate by the vertical lift of the hot'exhaust gases, a vertical spindle for the vane-wheel motor, said spindlebeing formed of a plurality of parts to permit the upper end connectedto the vanewheel motor to lift, when the vane-wheel is lifted, ofl thelower part of the spindle, and means for positively coupling saidvertical spindle of the vane-wheel motor to said movable piston.

PAUL LUCAS.

